Plumb-light.



, citizen of the United States, and a resident,

"UNI ED STATES.

, DAVID A. WALLACE, or cnroaeo, ILLINo'r's.

Proms-menu.

Specification of Letters Patent. Application filed April 21, 1913. Serial No. 762,538.

Patented, Oct. 13, 1914.

To all whom it may concern Be it known that I, DAVID A, a

' of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Plumb-Lights; and'I do hereby declare that the following is a full, clear,a nd exact description ofthe same, reference being had to the accompanying drawings, and to the.

numerals of reference marked thereon, which form a part of thls speclfication.

or roof of the tunnel. Permanent points in such a traverse are not only difiicult to find, but d ifiicu'l't of description, such that in event of the mine being resurveyed at a later.

time, great difiiculty is experienced in locating the points of the former traverse to check or correct the same.

This invention relates to means for per manentl-y marking a traverse and facilitating accurate chaining of the same. p

This invention has foranobject, means for permanently markin the' p'oi-nts of -a: traverse and the proper e evation thereof.

It'is also an object ofthe-invention to provide a plumb in combination with a light,

whereby the distance may. be accurately" chained and the line of sight and elevation determined by the light thereon.-

t is also,an object of this 'nvention to provide a combinationplumb and light, attached to an adjustable chain or other suspension means whereby the same'mayabe permanently attached'to the roof.

It is also an object of this inventibnfto provide a combination plumb and light wherein a protectiveshield is afforded the light, which, when retracted, automatically lights h cen ed hen eatendedtleet -i matically extinguishes the-same. a

It is also an ob' thereon is in alinement with the plumb, together with the suspension therefor.

Figure 1 is a fragc9ntac' t,po1nt 14, on the springfinger 11,

b ,threaded aperture to-receive therein the 'ect of this invention to provide a plumb light wherein the light:

"hood" '10,". is retracted, the contact 14, is

It is finally an object of this invention-to provide a simple and durable device impervious to weather conditions, the parts of the -elec tric bulb, the other terminal of and thus the bulb is lighted. When the y a device with parts shown in elevation,- Heretofore in making mining surveys the line of sight has been determined by an 011 lamp or candle suspended from the top wall .As shown in the'drawings The reference ;numeral 1, indicates the upper wall otqroof lof a'tunnel, in which are driven1s pikes2i Secured thereto by means of a chain 3*," profs vided with a turn buckles i, is a plumb "t-a s' itig designated as 5; the r not "in use the do vice is retained in a bracket'ti, which'may be attached to the'ltunnel roof at 'a convenient and accessible point; The casing 5",- of the device is lined with insulating material 7, andis' provided with a cover cap 8, which .hasi. a projectingefiange. around: its outerperiph'ery to afiord a stop for the ottset portion 9, of a non-rotatable: and slidable' hood or light shield 10, mounted on the out side of the casing. A spring contact finger 1 1 11', secured on'the outer suriiace of said cas-' ing '5,,is adapted" to be actuated'by the sleeve or hood 10, which-is enlarged, as clearly shown. in Figs: 3 and-4,1110, permit the hood to be moved downwardly-over the finger 11", the finger afiording'adimi-ting stop therefor when thesame-is retracted, and the inter-fit "ting oi the 1 finger -and ienlarged2 orti'on thehood serving to prevent t 2 ion' ofithe latter-J; 1 t r A battery 12,- with a contact: ring' 13; thereon, is conta ined within the casing, sa'id' contact :riii g adapted toil-be contacted by the I 1 l se er wad -ne d a dtrro d d nithz electric bulb 15, with the base thereof contacting the spring Contact 16, of the battery. .[t is readily seenthat, when the sleeve or :pressed against the ring 13, on the battery, thereby completing one line ,of an electric "circuit through the casing of the device to which is constantly in circuit due to the contact thereof with the spring member 16,

shield or hood 10, is moved upwardly the connected iii eyes 20, of the cover for attachment to the chain 23.

The operation is as follows: hen the original traverse is made of the mine the member 8,

spikes 2, are driven into the upper wall or .Vlce is removed roof thereof and the length of the chains 3, adjusted by means of the turn buckles 4, to

the proper length to indicate the elevation. is in use the shield or hood" .VVhen the device is retracted, thereby uncovering the bulb, and at the same time closing the circuit between the same and the battery to light the bulb. The light within the-bulb serves to illuminate any center mark thereon, although the entire light itself maybe used as a point in the line of sight, where a fine degree of accuracy is not desired. Having made the traverse of the mine, the hood 10, on the device is extended, thereby protecting the bulb and extinguishing the light therein and the device is then laid upon the bracket 6, secured on the roof of the tunnel. l/Vhen it is desired to make another survey, the defrom the bracket and allowed to center itself by its suspension and the hood being retracted and the bulb illuminated, a means is afforded of accurately re chaining or surveying the traverse.

I am aware that details of construction may be varied through a wide range without departing from the principles of this invention. I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a device of the class described a container, an electric lamp mounted on the top thereof, a battery contained within said container, a plumb weight secured on the; bottom of said container, and a non-rotatable protecting hood slidably mounted upon said container adapted to be moved upwardly to casing 5,. by means of a screw 18, and a yoke 19, is

surround said lamp and shield the same from breakage.

2. In a device of the class described, a container, a lamp mounted on the top thereof, a plumb weightmounted on the bottom, a battery within saidrontainer adapted to light said lamp, a protecting hood slidabl y mounted upon said container adapted to surround said lamp, and a switch released by movement of said hood to disconnect the lamp from the battery when said hood is moved up to surround said lamp.

3. In a device of the class described a plumb, a lamp mounted thereon,a hood slid-able upon said plumb adapted to surround and protect said lamp and a source of energy for said lamp adapted to be automatically disconnected from the lamp when said hood is moved upwardly around the lamp. I

4. In a device of the class described a plumb, an electric light mounted thereon,

and a protecting hood adapted to be extended over said light and acting simultaneously to disconnect .the source of energy therefrom to extinguish the same.

5. In a device of the class described a casing, a cover, a lamp supported thereon, eleetrical means for lighting the lamp, and a protecting hood for the lamp movable independentlyofy'said lamp and acting to disconnect said means from the lamp.

.6. In a device of the class described a lamp, an electrical circuit therefor, a casing. means movable with respect to the lamp thereon adapted to shield said lamp and switch mechanism operated by said means to open and close the circuit of the lamp.

7. In a device of the class described a'casing. a cover secured on the casing, non-rotatable protecting means fora lamp and slidable on the casing, cover to limit the movement of said means.

In testimony whereof I have hereunto subscribed. my namein the presence of two subscribing witnesses.

DAVID AQWALLAGE. Witnesses LAWRENCE Rnms'ram, EDWARD HUSBAND.

and a flange on said 

